Playback Issues with this score

I don't know why, but ever since I've upgraded to MuseScore 4, I've had this problem. With this score specifically, as soon as the piccolo part starts playing on playback, the right hand of the piano cuts out, and I get no sound whatsoever from that part. Before the piccolo part comes in, it's just fine. But after, nothing, even when I click on the individual notes.

None of them are muted, and neither is the piano part itself. Whether I use the new sounds I downloaded from MuseHub or the MS Basic sounds, I get the same result.

How do I fix this? It's been driving me crazy!